Shoulder Muscles

Question 1

1

a. innervation
b. action

Answer 1

deltoid muscle:

a. axillary nerve
b. abducts arm, extends, and flexes arm

Question 2

2

a. innervation
b. action

Answer 2

acromion

Question 3

3

a. innervation
b. action

Answer 3

supraspinatus muscle:

a. suprascapular nerve
b. abducts the arm

Question 4

4

a. innervation
b. action

Answer 4

pectoralis minor muscle:

a. medial pectoral nerve
b. draws scapula inferiorly and anteriorly

Question 5

5

a. innervation
b. action

Answer 5

subscapularis muscle:

a. upper and lower subscapular nerve
b. adducts + medially rotates the arm

Question 6

6

a. innervation
b. action

Answer 6

pectoralis major muscle:
a. lateral pectoral nerve
b. adducts + medially rotates arm
(also draws scapula inferiorly and anteriorly)

Question 7

7

a. innervation
b. what is the terminal branch of this nerve?
c. action

Answer 7

coracobrachialis muscle:

a. musculocutaneous nerve
b. lateral cutaneous nerve of forearm
c. adducts and flexes the arm

Question 8

8

a. innervation
b. action

Answer 8

teres major muscle:

a. lower subscapular nerve
b. adducts and medially rotates the arm; helps extend arm

Question 9

9

a. innervation
b. action

Answer 9

lattisimus dorsi:

a. thoracodorsal nerve
b. extends, adducts, and medially rotates the arm

Question 10

10

a. innervation
b. action

Answer 10

infraspinatus muscle:

a. suprascapular nerve
b. laterally rotates arm

Question 11

11

a. innervation
b. action

Answer 11

teres minor muscle:

a. axillary nerve
b. laterally rotates arm

Question 12

12

a. innervation
b. action

Answer 12

long head of triceps brachii:

a. radial nerve
b. chief extensor of forearm

Question 13

13

a. innervation
b. action

Answer 13

lateral head of triceps brachii:

a. radial nerve
b. chief extensor of forearm